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고학룡,안순철,Ko, Hack-Ryong,Ahn, Soon-Cheol 한국해양바이오학회 2007 한국해양바이오학회지 Vol.2 No.1
This aims to review natural products transformed by mimic intestinal metabolisms with microorganisms and hydrolytic enzymes, which exhibit enforced biological activity, higher extraction yield and identification of active components. In the process, transformation to the smaller active compounds with enzymes and microbes mimics the pharmacological action of natural products by intestinal bacteria. In order to establish conditions for the fermentation and enzyme reaction, it is required to choose several natural products for biotransformation and investigate the optimal conditions for the fermentation or the enzyme reaction such as composition, temperature, pH, inoculum, and cultivation time. It is expected an increase of the internal absorption of the active materials without regard to the intestinal microbes or its ability through biosynthesis of the active materials by the microbes and enzymes. And this techniques can be applied to biotransformation of natural products such as sesaminol, resveratrol, 1-deoxy nojirimycin, naringenin, quercetin, and baicalin and to the metabolism study using the animal model.
Pseudomonas aeruginosa 3120 으로부터 항생물질의 생산 , 분리 및 특성
고학룡(Hack Ryong Ko),전효곤(Hyo Kon Chun),고영희(Yung Hee Kho),성낙계(Nack Kie Sung) 한국응용생명화학회 1993 Applied Biological Chemistry (Appl Biol Chem) Vol.36 No.6
A strain that inhibited the growth of Pellicularia sasakii was isolated from the soil and identified as Pseudomonas aeruginosa 3120. A dark brownish antibiotic. MRL3120 isolated and purified from the culture broth of P. aeruginosa 3120 was soluble in ethylacetate, chloroform and methanol, and it was active against gram-positive and negative bacteria as well as fungi. The structure of MRL3120 was identified as a chelate compound consisting of two N-methyl-N-thioformyl-hydroxylamine and a copper ion by the analysis of UV. IR, and EI-MS spectra and other physico-chemical properties and supposed to have a structure of fluopsin C related compound. Addition of CuSO₄ into the fermentation medium containing soybean meal increased antifungal activity but no activity was found in the presence of EDTA (0.1%, v/v). However antibiotic MRL3120 was not produced in the fermentation medium containing soytone instead of soybean meal but it was rapidly produced by the addition of CuSO₄.
오원근,강대욱,박찬선,안순철,고학룡,김보연,민태익,안종석,이현선,Oh, Won-Keun,Kang, Dae-Ook,Park, Chan-Sun,Ahn, Soon-Cheol,Ko, Hack-Ryong,Kim, Bo-Yeon,Mheen, Tae-Ik,Ahn, Jong-Seog,Lee, Hyun-Sun 한국생약학회 1997 생약학회지 Vol.28 No.1
The total MeOH extracts of 149 herbal medicines were screened far angiotensin ll receptor antagonistic activity using rat liver membrane fraction. Four medicinal plants- Atractylodes japonica, Evodia officinalis, Scutellaria baicalensis, Machilus thunbergii showed strong angiotensin ll antagonistic activity.
갯기름나물의 쿠마린에 의한 RAW 264.7 세포주의 Nitric Oxide 생성 저해활성
최희철,노태철,김보연,고학룡,오원근,성창근,민태익,안종석,이현선,Choi, Hee-Cheol,Rho, Tae-Cheol,Kim, Bo-Yeon,Ko, Hack-Ryong,Oh, Won-Keun,Seong, Chang-Keun,Mheen, Tae-Ick,Ahn, Jong-Seog,Lee, Hyun-Sun 한국생약학회 1999 생약학회지 Vol.30 No.2
During the screening for inhibitors of nitric oxide production in LPS-activated macrophage, RAW 264.7 cells. Five coumarins were isolated from chloroform extract of the root of Peucedanum japonicum. They were identified as praeruptorin A (1), xanthotoxin (2), psoralen (3), isopimpinellin (4), bergapten (5) on the basis of spectroscopic methods. The $IC_{50}$ values for nitrite production by activated macrophages were about $1.5\;{\mu}g/ml$ (1), $0.3\;{\mu}g/ml$ (2), $1.0\;{\mu}g/ml$ (3), $25\;{\mu}g/ml$ (4), $25\;{\mu}g/ml$ (5), respectively. However, the inducible nitric oxide synthase (iNOS) was not inhibited by treatment with these compounds. Their inhibitory effect on nitric oxide production was resulted from the supperssion of iNOS expression.
곰팡이 분리주 No. 51005로부터 포스포리파제 C 저해물질 앙길로스포랄의 분리
오원근(Won Keun Oh),이현선(Hyun Sun Lee),안순철(Soon Cheol Ahn),고학룡(Hack Ryong Ko),김보연(Bo Yeon Kim),민태익(Tae Ick Mheen),안종석(Jong Seog Ahn) 대한약학회 1997 약학회지 Vol.41 No.4
MT 51005 as a potent inhibitor of phospholipase C(PLC) was purified from the culture broth of a fungal strain No. 51005 isolated from soil. It was identified as a benzaldehyde derivative, anguillosporal. by the physico-chemical properties and spectroscopic data. Anguillosporal showed the inhibitory activity against purified PLC with an IC50 of 13mcg/ml. And it also inhibited the formation of inositol phosphates(IPt) in platelet-derived growth factor(PDGF)-stimulated NIH3T3gamma1 cells with an IC50 of 0.8mcg/ml.
전립선암 세포주인 PC-3에서 cordycepin에 의해 유도된 세포 내 칼슘농도 변화와 미토콘드리아 기능 상실을 통한 세포사멸 유도
Dong-Min Kang(강동민),Kwang-Youn Kim(김광연),Sun-Nyoung Yu(유선녕),Young-Rang Jin(진영랑),Hyun-Joo Jeon(전현주),Sang-Hun Kim(김상헌),Sung-Sik Chun(전성식),Hack-Ryong Ko(고학룡),Soon-Cheol Ahn(안순철) 한국생명과학회 2011 생명과학회지 Vol.21 No.3
Cordycepin은 동충하초로부터 분리한 생리활성 물질로써 항암활성을 가진다고 보고되어 있다. 하지만 그 정확한 항암 기전은 아직 확실하게 밝혀져 있지 않다. 이에 인간 전립선 암 세포주인 PC-3 세포를 이용하여 apoptosis와 그에 관련한 경로를 조사함으로써 cordycepin의 항암효과를 연구하였다. MTT assay를 통해 세포독성을 알아보았고 Annexin-V/PI 염색과 Ca²? 농도, ROS의 생성, MMP의 변화를 관찰하여 apoptosis 경로를 확인하였다. 뿐만 아니라 Western blot analysis를 이용하여 apoptosis와 관련된 단백질의 발현 정도를 확인하였다. 본 연구의 결과에서 cordycepin은 apoptosis 관련 단백질의 발현을 조절함으로써 apoptosis와 관련이 있음을 확인할 수 있었고, 미토콘드리아 관련 apoptosis 경로를 확인한 결과, ROS의 생성, Ca²?의 증가 그리고 미토콘드리아 막 전위의 붕괴를 통해 apoptosis 기전이 유도됨을 알 수 있었다. 이상의 결과로부터 cordycepin은 PC-3 세포에 대하여 ROS와 Ca²?의 농도 증가를 통해 MMP를 변화시켜 미토콘드리아 관련 apoptosis 기전을 거쳐 caspase의 활성을 증가시킴으로써 apoptosis를 유도함을 알 수 있었다. Cordycepin (3'-deoxyadenosine), a nucleoside derivative isolated from Cordyceps militaris, is reported to have antitumor effects. However, neither its molecular mechanism nor its molecular targets are well understood. In the present study, molecular mechanisms for the anti-tumor effects of cordycepin were investigated in human prostate cancer PC-3 cells. The MTT assay was used to detect cell viability. Annexin V/FITC assay, reactive oxygen species (ROS) production, mitochondrial membrane potential (MMP), and Ca²? flux were used to assess for the presence of apoptosis. Western blot analysis was used to detect protein expression. Treatment of cordycepin resulted in significantly decreased cell viability of PC-3 cells in a dose- and time-dependent manner. A dose-dependent apoptotic cell death was also measured by flow cytometery analysis. Molecular mechanistic studies of apoptosis unraveled cordycepin treatment resulted in significant mitochondrial dysfunction, ROS production, and elevation of Ca²? concentrations. These phenomena were followed activation of caspase-3, subsequently leading to PARP cleavage and cell apoptosis. Taken together, cordycepin induces apoptosis in PC-3 cells through regulation of a mitochondrial mediated pathway.
방선균 분리주가 생산하는 Phospholipase C 저해물질인 MT2617-2B의 분리 및 특성
고학룡,이현선,오원근,안순철,김보연,강대욱,민태익,안종석 한국미생물생명공학회 ( 구 한국산업미생물학회 ) 1996 한국미생물·생명공학회지 Vol.24 No.1
방선균 분리주 MT2617-2의 배양액으로 부터 phospholipase C (PLC) 저해물질인 MT2617-2B를 n-butanol 추출 및 column chromatography 법을 이용하여 분리하였다. MT2617-2B는 IR ^13C- 및 ^1H-NMR 그리고 ESI-MS에 의한 구조분석 결과, 한 개의 hemiketal ring, polyhydroxyl 및polymethyl groups으로 구성되었으며 side chain으로 한 개씩의 malonate 및 guanidine group을 가지는 분자량 1057의 macrolide 화합물이었다. 따라서, MT2617-2B를 기존의 macrolide 항생제인 copiamycin 및 niphithricin A로 동정하였다. 한편, MT2617-2B는 methanol 용액에서 실온에서 방치하였을 때 도일한 분자량을 가진 두 개의 이성질체를 생성하였다. PLC γ1과 -β1에 대해 각각 25 및 50㎍/㎖의 IC_50 값을 가지며, Staphylococcus aureus 와 Candida albicans에 대해서는 항균활성을 나타내지만 Escherichia coli에는 나타내지 않았다. A phospholipase C (PLC) inhibitor (MT2617-2B) was isolated from the culture broth of actionmycetes isolate MT2617-2 by the extraction with n-butanol and column chromatographic techniques. The molecular weight of the inhibitor was 1057, by the spectroscopic analyses of IR ^13C- and ^1H-NMR and ESI-MS. The chemical structure of MT2617-2B was found to be a macrolide compound consisted of a hemiketal ring, polyhydroxyl and polymethyl groups, which had a malonate and guanidine group as its side chain. MT2617-2B produced its two isomers having the same molecular weight by standing in methanol solution at room temperature. Therefore, MT2617-2B was identified as copiamycin and niphithricin A, macrolide antibiotics. The values of IC_50 against PLC γ1 and PLC-β1 were 25 and 50㎍/㎖, respectively. MT2617-2B had antimicrobial activities against Staphylococcus aureus and Candida albicans, but not against Escherichia coli.